mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-30 19:46:42 +07:00
180ae2037f
This moves in the necessary libgcc bits and kills off the libgcc linking for sh64 kernels as well. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
121 lines
3.2 KiB
ArmAsm
121 lines
3.2 KiB
ArmAsm
.section .text..SHmedia32,"ax"
|
|
.align 2
|
|
.global __udivdi3
|
|
__udivdi3:
|
|
shlri r3,1,r4
|
|
nsb r4,r22
|
|
shlld r3,r22,r6
|
|
shlri r6,49,r5
|
|
movi 0xffffffffffffbaf1,r21 /* .l shift count 17. */
|
|
sub r21,r5,r1
|
|
mmulfx.w r1,r1,r4
|
|
mshflo.w r1,r63,r1
|
|
sub r63,r22,r20 // r63 == 64 % 64
|
|
mmulfx.w r5,r4,r4
|
|
pta large_divisor,tr0
|
|
addi r20,32,r9
|
|
msub.w r1,r4,r1
|
|
madd.w r1,r1,r1
|
|
mmulfx.w r1,r1,r4
|
|
shlri r6,32,r7
|
|
bgt/u r9,r63,tr0 // large_divisor
|
|
mmulfx.w r5,r4,r4
|
|
shlri r2,32+14,r19
|
|
addi r22,-31,r0
|
|
msub.w r1,r4,r1
|
|
|
|
mulu.l r1,r7,r4
|
|
addi r1,-3,r5
|
|
mulu.l r5,r19,r5
|
|
sub r63,r4,r4 // Negate to make sure r1 ends up <= 1/r2
|
|
shlri r4,2,r4 /* chop off leading %0000000000000000 001.00000000000 - or, as
|
|
the case may be, %0000000000000000 000.11111111111, still */
|
|
muls.l r1,r4,r4 /* leaving at least one sign bit. */
|
|
mulu.l r5,r3,r8
|
|
mshalds.l r1,r21,r1
|
|
shari r4,26,r4
|
|
shlld r8,r0,r8
|
|
add r1,r4,r1 // 31 bit unsigned reciprocal now in r1 (msb equiv. 0.5)
|
|
sub r2,r8,r2
|
|
/* Can do second step of 64 : 32 div now, using r1 and the rest in r2. */
|
|
|
|
shlri r2,22,r21
|
|
mulu.l r21,r1,r21
|
|
shlld r5,r0,r8
|
|
addi r20,30-22,r0
|
|
shlrd r21,r0,r21
|
|
mulu.l r21,r3,r5
|
|
add r8,r21,r8
|
|
mcmpgt.l r21,r63,r21 // See Note 1
|
|
addi r20,30,r0
|
|
mshfhi.l r63,r21,r21
|
|
sub r2,r5,r2
|
|
andc r2,r21,r2
|
|
|
|
/* small divisor: need a third divide step */
|
|
mulu.l r2,r1,r7
|
|
ptabs r18,tr0
|
|
addi r2,1,r2
|
|
shlrd r7,r0,r7
|
|
mulu.l r7,r3,r5
|
|
add r8,r7,r8
|
|
sub r2,r3,r2
|
|
cmpgt r2,r5,r5
|
|
add r8,r5,r2
|
|
/* could test r3 here to check for divide by zero. */
|
|
blink tr0,r63
|
|
|
|
large_divisor:
|
|
mmulfx.w r5,r4,r4
|
|
shlrd r2,r9,r25
|
|
shlri r25,32,r8
|
|
msub.w r1,r4,r1
|
|
|
|
mulu.l r1,r7,r4
|
|
addi r1,-3,r5
|
|
mulu.l r5,r8,r5
|
|
sub r63,r4,r4 // Negate to make sure r1 ends up <= 1/r2
|
|
shlri r4,2,r4 /* chop off leading %0000000000000000 001.00000000000 - or, as
|
|
the case may be, %0000000000000000 000.11111111111, still */
|
|
muls.l r1,r4,r4 /* leaving at least one sign bit. */
|
|
shlri r5,14-1,r8
|
|
mulu.l r8,r7,r5
|
|
mshalds.l r1,r21,r1
|
|
shari r4,26,r4
|
|
add r1,r4,r1 // 31 bit unsigned reciprocal now in r1 (msb equiv. 0.5)
|
|
sub r25,r5,r25
|
|
/* Can do second step of 64 : 32 div now, using r1 and the rest in r25. */
|
|
|
|
shlri r25,22,r21
|
|
mulu.l r21,r1,r21
|
|
pta no_lo_adj,tr0
|
|
addi r22,32,r0
|
|
shlri r21,40,r21
|
|
mulu.l r21,r7,r5
|
|
add r8,r21,r8
|
|
shlld r2,r0,r2
|
|
sub r25,r5,r25
|
|
bgtu/u r7,r25,tr0 // no_lo_adj
|
|
addi r8,1,r8
|
|
sub r25,r7,r25
|
|
no_lo_adj:
|
|
mextr4 r2,r25,r2
|
|
|
|
/* large_divisor: only needs a few adjustments. */
|
|
mulu.l r8,r6,r5
|
|
ptabs r18,tr0
|
|
/* bubble */
|
|
cmpgtu r5,r2,r5
|
|
sub r8,r5,r2
|
|
blink tr0,r63
|
|
|
|
/* Note 1: To shift the result of the second divide stage so that the result
|
|
always fits into 32 bits, yet we still reduce the rest sufficiently
|
|
would require a lot of instructions to do the shifts just right. Using
|
|
the full 64 bit shift result to multiply with the divisor would require
|
|
four extra instructions for the upper 32 bits (shift / mulu / shift / sub).
|
|
Fortunately, if the upper 32 bits of the shift result are nonzero, we
|
|
know that the rest after taking this partial result into account will
|
|
fit into 32 bits. So we just clear the upper 32 bits of the rest if the
|
|
upper 32 bits of the partial result are nonzero. */
|